lix/doc/manual/nix-lang-ref.xml
2004-04-08 13:31:57 +00:00

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<chapter>
<title>Nix Language Reference</title>
<sect1>
<title>Grammar</title>
<para>
</para>
<productionset>
<title>Expressions</title>
<production id="nix.expr">
<lhs>Expr</lhs>
<rhs>
<nonterminal def="#nix.expr_function" />
</rhs>
</production>
<production id="nix.expr_function">
<lhs>ExprFunction</lhs>
<rhs>
'{' <nonterminal def="#nix.formals" /> '}' ':' <nonterminal def="#nix.expr_function" />
<sbr />|
<nonterminal def="#nix.expr_assert" />
</rhs>
</production>
<production id="nix.expr_assert">
<lhs>ExprAssert</lhs>
<rhs>
'assert' <nonterminal def="#nix.expr" /> ';' <nonterminal def="#nix.expr_assert" />
<sbr />|
<nonterminal def="#nix.expr_if" />
</rhs>
</production>
<production id="nix.expr_if">
<lhs>ExprIf</lhs>
<rhs>
'if' <nonterminal def="#nix.expr" /> 'then' <nonterminal def="#nix.expr" />
'else' <nonterminal def="#nix.expr" />
<sbr />|
<nonterminal def="#nix.expr_op" />
</rhs>
</production>
<production id="nix.expr_op">
<lhs>ExprOp</lhs>
<rhs>
'!' <nonterminal def="#nix.expr_op" />
<sbr />|
<nonterminal def="#nix.expr_op" /> '==' <nonterminal def="#nix.expr_op" />
<sbr />|
<nonterminal def="#nix.expr_op" /> '!=' <nonterminal def="#nix.expr_op" />
<sbr />|
<nonterminal def="#nix.expr_op" /> '&amp;&amp;' <nonterminal def="#nix.expr_op" />
<sbr />|
<nonterminal def="#nix.expr_op" /> '||' <nonterminal def="#nix.expr_op" />
<sbr />|
<nonterminal def="#nix.expr_op" /> '->' <nonterminal def="#nix.expr_op" />
<sbr />|
<nonterminal def="#nix.expr_op" /> '//' <nonterminal def="#nix.expr_op" />
<sbr />|
<nonterminal def="#nix.expr_op" /> '~' <nonterminal def="#nix.expr_op" />
<sbr />|
<nonterminal def="#nix.expr_op" /> '?' <nonterminal def="#nix.id" />
<sbr />|
<nonterminal def="#nix.expr_app" />
</rhs>
</production>
<production id="nix.expr_app">
<lhs>ExprApp</lhs>
<rhs>
<nonterminal def="#nix.expr_app" /> '.' <nonterminal def="#nix.expr_select" />
<sbr />|
<nonterminal def="#nix.expr_select" />
</rhs>
</production>
<production id="nix.expr_select">
<lhs>ExprSelect</lhs>
<rhs>
<nonterminal def="#nix.expr_select" /> <nonterminal def="#nix.id" />
<sbr />|
<nonterminal def="#nix.expr_simple" />
</rhs>
</production>
<production id="nix.expr_simple">
<lhs>ExprSimple</lhs>
<rhs>
<nonterminal def="#nix.id" /> |
<nonterminal def="#nix.int" /> |
<nonterminal def="#nix.str" /> |
<nonterminal def="#nix.path" /> |
<nonterminal def="#nix.uri" />
<sbr />|
'(' <nonterminal def="#nix.expr" /> ')'
<sbr />|
'{' <nonterminal def="#nix.bind" />* '}'
<sbr />|
'let' '{' <nonterminal def="#nix.bind" />* '}'
<sbr />|
'rec' '{' <nonterminal def="#nix.bind" />* '}'
<sbr />|
'[' <nonterminal def="#nix.expr_select" />* ']'
</rhs>
</production>
<production id="nix.bind">
<lhs>Bind</lhs>
<rhs>
<nonterminal def="#nix.id" /> '=' <nonterminal def="#nix.expr" /> ';'
<sbr />|
'inherit' ('(' <nonterminal def="#nix.expr" /> ')')? <nonterminal def="#nix.id" />* ';'
</rhs>
</production>
<production id="nix.formals">
<lhs>Formals</lhs>
<rhs>
<nonterminal def="#nix.formal" /> ',' <nonterminal def="#nix.formals" />
| <nonterminal def="#nix.formal" />
</rhs>
</production>
<production id="nix.formal">
<lhs>Formal</lhs>
<rhs>
<nonterminal def="#nix.id" />
<sbr />|
<nonterminal def="#nix.id" /> '?' <nonterminal def="#nix.expr" />
</rhs>
</production>
</productionset>
<productionset>
<title>Terminals</title>
<production id="nix.id">
<lhs>Id</lhs>
<rhs>[a-zA-Z\_][a-zA-Z0-9\_\']*</rhs>
</production>
<production id="nix.int">
<lhs>Int</lhs>
<rhs>[0-9]+</rhs>
</production>
<production id="nix.str">
<lhs>Str</lhs>
<rhs>\"[^\n\"]*\"</rhs>
</production>
<production id="nix.path">
<lhs>Path</lhs>
<rhs>[a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+</rhs>
</production>
<production id="nix.uri">
<lhs>Uri</lhs>
<rhs>[a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&amp;\=\+\$\,\-\_\.\!\~\*\']+</rhs>
</production>
<production id="nix.ws">
<lhs>Whitespace</lhs>
<rhs>
[ \t\n]+
<sbr />|
\#[^\n]*
<sbr />|
\/\*(.|\n)*\*\/
</rhs>
</production>
</productionset>
</sect1>
</chapter>